“Parts Per Billion” surrounds three couples, who are each facing a toxic outbreak. Hartnett's co-star Rosario Dawson told Bring Me The News that the film was shot in Detroit, but Hartnett was commuter.

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“He was coming back and forth from Minnesota the entire time when we were shooting,” Dawson said. “We were complaining about the cold in Detroit, and he was like, ‘Please.’”